Mt. Pyre is a Pokémon graveyard, similar to Kanto's Pokémon Tower. It consists of two areas: the inside, a "cave" filled with Pokémon trainers that functions as a graveyard, and the outer mountain, which can be reached by exiting from inside. Mt. Pyre is considered the counterpart of the Cave of Origin (the cave where life begins), as Mt. Pyre is "the place where life ends." Atop the mountain are an old couple who guard two orbs, the Red Orb and Blue Orb. They are the grandparents of Phoebe of the Elite Four.

Mt. Pyre plays a major role in the video games. In Pokémon Ruby, the player has to battle Team Magma members as they steal the Red Orb to control Groudon, while in Pokémon Sapphire and Emerald, the player is forced to battle Team Aqua members who are trying to steal the Blue Orb to control Kyogre. In Emerald, after Groudon and Kyogre disappear at Sootopolis City, Maxie and Archie return both orbs to their respective perches at the summit of Mt. Pyre, providing closure to the game's main plot.